[blimp] Add SkPicture caching support.

blimp/engine/renderer/blimp_engine_picture_cache_unittest.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "blimp/engine/renderer/blimp_engine_picture_cache.h"
+
+#include "blimp/test/support/compositor/picture_cache_test_support.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+
+namespace blimp {
+namespace engine {
+
+namespace {
+class BlimpEnginePictureCacheTest : public testing::Test {
+ public:
+  BlimpEnginePictureCacheTest() : cache_(nullptr) {}
+
+ protected:
+  BlimpEnginePictureCache cache_;
+};
+
+TEST_F(BlimpEnginePictureCacheTest, TwoCachedPicturesCanBeRetrieved) {
+  EXPECT_EQ(0U, cache_.CalculateCacheUpdateAndFlush().size());
+
+  sk_sp<const SkPicture> picture1 = CreateSkPicture(SK_ColorBLUE);
+  cache_.MarkPictureForRegistration(picture1.get());
+  sk_sp<const SkPicture> picture2 = CreateSkPicture(SK_ColorRED);
+  cache_.MarkPictureForRegistration(picture2.get());
+
+  cc::PictureCacheUpdate update = cache_.CalculateCacheUpdateAndFlush();
+  ASSERT_EQ(2U, update.size());
+  cc::PictureData picture_data_a = update.at(0);
+  cc::PictureData picture_data_b = update.at(1);
+
+  // Order is unknown, but pictures should be the same.
+  EXPECT_TRUE((SamePicture(picture1, picture_data_a) &&
+               SamePicture(picture2, picture_data_b)) ||
+              (SamePicture(picture2, picture_data_a) &&
+               SamePicture(picture1, picture_data_b)));
+
+  EXPECT_EQ(0U, cache_.CalculateCacheUpdateAndFlush().size());
+}
+
+TEST_F(BlimpEnginePictureCacheTest, SamePictureOnlyReturnedOnce) {
+  EXPECT_EQ(0U, cache_.CalculateCacheUpdateAndFlush().size());
+
+  sk_sp<const SkPicture> picture = CreateSkPicture(SK_ColorBLUE);
+  cache_.MarkPictureForRegistration(picture.get());
+  cache_.MarkPictureForRegistration(picture.get());
+
+  cc::PictureCacheUpdate update = cache_.CalculateCacheUpdateAndFlush();
+  ASSERT_EQ(1U, update.size());
+  cc::PictureData picture_data = update.at(0);
+  EXPECT_TRUE(SamePicture(picture, picture_data));
+}
+
+}  // namespace
+
+}  // namespace engine
+}  // namespace blimp